9to5Mac has obtained some convincing evidence that Amazon's working on its own credit card swipers, aiming its sights at incumbent Square for payments-on-the-go. Because if you're not going to buy from Amazon, at the very least they can handle the money.

The internal Staples documents highlighted by 9to5Mac indicate that the Everything Store plans to sell its tiny credit-card-taker for 10 bucks apiece, launching as early as August 12. It's not clear what advantages an Amazon card swiper would hold over similar options from Square and others, although presumably it'll be competitive through sheer force of scale. That, and its recently launched Amazon Wallet program, a mobile payments system that was pretty bare-bones at launch.

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We've reached out to Amazon for confirmation and will update if and when we hear back. For now, the only thing that's for certain is that this kind of competition might be what finally sends Square packing. [9to5Mac]